Whites have always been a small percentage of the world population. I think they will last because even though western Europe and america and canada and australia are letting huge amounts of immigrants in, eastern europe and russia as well as white enclaves all over the planet will continue to be almost exclusively white even though they will be drastically outnumbered by other populations.
It would also help if sub saharan africans could use condoms and birth control because they are not gonna stop fucking anytime soon. The last thing this planet needs is more people anywhere, especially not in sub saharan africa where they already cant support their own population. The entire planet needs to take an approach like china and limit their country’s birth rate.